It's not a binary thing. It's just a signal to algo. I think in the background it maps over what that signal means, whether you are disliking whole top-level category or a sub-category towards the leaf. I used to get NFL videos, I disliked few times, still received those videos, I disliked them again, now its gone altogether. Also the algo might have exponentially decaying memory. So your signal is not permanent. You can always watch a Mr. Beast video again and it will come back to your feed.
Am I hiding all videos from Mr Beast himself?
Am I hiding all videos with Mr Beast style thumbnails?
Am I hiding all videos with charity drive messages from popular influencers?
Am I hiding all video who take sponsor breaks at the 2-3 minute mark?
Am I hiding all videos who don't provide my typical type of content when compared to all my other subscriptions?
Am I hiding all videos which were liked by 13-21 year olds?
And multiplied in every possible dimension across every possible video category....